21222221101010 has 16 divisors (see below), whose sum is σ = 38288219693976. Its totient is φ = 8469283615488.

The previous prime is 21222221100973. The next prime is 21222221101073. The reversal of 21222221101010 is 1010112222212.

It can be written as a sum of positive squares in 4 ways, for example, as 13231937330329 + 7990283770681 = 3637573^2 + 2826709^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21222221101010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2450598569 + ... + 2450607228.

Almost surely, 2^{21222221101010} is an apocalyptic number.

21222221101010 is a deficient number, since it is larger than the sum of its proper divisors (17065998592966).

21222221101010 is a wasteful number, since it uses less digits than its factorization.

21222221101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901206237.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222221101010 its reverse (1010112222212), we get a palindrome (22232333323222).

The spelling of 21222221101010 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, one hundred one thousand, ten".